Processing electronic messages

ABSTRACT

The invention relates to a system for processing electronic messages. The system includes a communications module configured to interoperate with a plurality of email servers and coupled to a message processing module. The message processing module is configured to identify inbound messages and process such messages based on statistical analysis, user training, and shared rules. The system is compatible with most existing email clients and servers. The invention also relates to methods for processing messages and methods for training message processing systems.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part of U.S. patent application Ser. No. 13/968,680 filed Aug. 16, 2013, now U.S. Pat. No. 9,176,970, which claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application No. 62/118,332 filed Feb. 19, 2015, which applications are incorporated herein by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to systems and methods for processing electronic messages.

BACKGROUND OF RELATED TECHNOLOGY

Electronic mail (email) is an established form of communication used ubiquitously by individuals in business and private sectors. An email user may receive a large number of inbound email messages in a given day, which are traditionally delivered to a single folder (typically referred to as the “Inbox”) in the user's email system. To identify those messages that the user considers important, the user must review each message in the Inbox, and must manually delete messages that are not considered to be important in order to remove them from the Inbox. Such systems are therefore inefficient in that they require the user to spend a considerable amount of time managing inbound email.

To improve on such traditional systems, some modern email systems provide “filters” which act on (process) inbound messages. Such filters may be based on rules established by the user which define a set of actions to be performed on inbound messages. For example, the user may create a rule whereby any message containing the phrase “Special Offer” is filtered by the system such that it is delivered to a folder intended to contain unimportant messages (e.g. a “Spam” folder). Depending on the system, the message may be automatically moved to the Spam folder upon delivery to the Inbox, or it may bypass the Inbox and be delivered directly to the Spam folder.

While such rule-based-filters provide the user with precise control over inbound messages, they can be time-consuming to create and maintain. Moreover, rule-based filters will not filter messages that do not match a rule previously established by the user, requiring the user to manually review and act on such messages.

To overcome the limitations of rule-based filters, some email systems now include “predictive” filters. Predictive filters use fuzzy logic to determine the action that should be taken on inbound messages, on the basis of message information and a priori information that is stored in the system. Thus, predictive filters are capable of operating without user intervention and may also capable of acting on messages from unknown recipients. For example, email systems are known that rank inbound messages based on metrics derived from earlier user actions to related messages (e.g. Gmail's™ Priority Inbox™ feature; U.S. Published Application No. US20060235933; U.S. Pat. No. 8,095,612).

Some email systems that rank/prioritize email may rely on a specific email client having a custom User Interface (UI) to visually separate important from messages from unimportant messages. Such email systems have a server and client parts which are designed to be used together and thus may be incompatible, or provide degraded operation if a third-part email client is used. For example, Priority Inbox™ provides a custom web UI and mobile application UI (e.g. U.S. Pat. No. 8,312,096) to visually separate a user's Inbox into two or more distinct groups, such as “Important” messages and “Everything Else.” However, if a third-party email client is used in conjunction with Gmail's™ email server, such a visual separation between important and unimportant messages may be lost.

While rule-based filters and predictive filters offer increased efficiency in managing email, they are not included in all email systems. Further, many users currently use legacy email systems that lack one or more of the features described above. Some users may be reluctant to switch email systems because of the time and effort involved. Other users may be required by their employer to use a legacy email system.

Thus, there is a need in the art for improved email filtering systems, in particular systems which may be used universally, which are compatible with existing email servers and clients, and which may be customized and/or expanded upon to meet a user's specific needs.

SUMMARY OF THE INVENTION

The present invention provides systems and methods for processing electronic messages which are capable of working with existing systems. Thus, the systems and methods of the present invention allow a user to customize and expand on the filtering features of an existing email system, including adding various filtering capabilities to an existing system that lacks some or all such capabilities. Moreover, the systems and methods disclosed herein are compatible with existing electronic message clients, including desktop, mobile, and tablet email applications.

In one aspect, a method for processing electronic messages includes: connecting to a message server; accessing a user account; retrieving a plurality of source message identifiers from the message server, each source being associated with a source folder; selecting a target message identifier from the plurality of source messages identifiers; determining a target folder associated with the account; and instructing the message server to copy the target message from the source folder to the target folder.

The method can further include one or more of the following steps: instructing the message server to delete the message associated with the target message identifier from the source folder; storing a processed message record in a database, the processed message record having a message identifier associated with the target message identifier and a folder identifier associated with the target folder; fetching a user account record from a database, the account record having a plurality of authentication tokens, and authenticating with the message server using the plurality of authentication tokens, which may be encrypted; fetching a source folder record from a database, the source folder record having a folder identifier associated with the source folder and a last message identifier, wherein retrieving a plurality of source message identifiers is based upon the last message identifier; receiving a notification from the message server in response to a message being delivered to the source folder; retrieving metadata associated with the target message identifier, wherein the target folder is determined by comparing the target message metadata to a plurality of training records; and fetching a plurality of folder records from a database, each folder record having a last known folder identifier, retrieving a plurality of current folder identifiers from the message server, comparing the plurality of last known folder identifiers to the plurality of current folder identifiers, and storing a folder record, the folder record having a folder identifier associated with the renamed folder.

The method can further include: selecting a training folder within the account; retrieving a first plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder; retrieving a second plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder; detecting a trained message identifier included in the second plurality of messages and not included in the first plurality of messages; retrieving metadata (e.g. information about the message sender) associated with the trained message identifier; and storing a training record, the training record having a folder identifier associated with the training folder identifier and metadata associated with the trained message metadata.

In another aspect, a computer system includes: a communications module configured to retrieve a plurality of message identifiers from a message server and to instruct the message server to copy a message from a first folder to a second folder; and a message processing module coupled to the communications module and configured to determine a source folder associated with user account upon a message server, retrieve a plurality of source message identifiers using the communications module, each source message being associated with the source folder, select a target message identifier from the plurality of source message identifiers, determine a target folder associated with the user account and instruct the message server to copy a message associated with the target message identifier from the source folder to the target folder.

The computer system can further include a database module configured to store a processed message records in a database, each processed message record having a message identifier and a folder identifier, wherein the message processing module is coupled to the database module and further configured to store processed message record associated with the target message identifier and the target folder. The database module can be further configured to store training records to the database, each training record having a folder identifier and metadata, and the message processing module can be further configured to determine a training folder within the account, retrieve a first plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder, retrieve a second plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder, detect a trained message identifier included in the second plurality of messages and not included in the first plurality of messages, retrieve metadata associated with the trained message identifier, and store a training record using the database module, the training record folder identifier associated with the training folder and the training record metadata associated with the trained message metadata.

In another aspect, a computer program product embodied on a computer medium includes instructions for: connecting to a message server; accessing a user account; determining a source folder associated with the user account; retrieving a plurality of source messages from the message server, each source message having an identifier and being associated within the source folder, selecting a target message from the plurality of source messages; determining a target folder associated with the account; and instructing the message server to copy the target message from the source folder to the target folder.

The computer program product can further include instructions for: detecting that a folder within the account was renamed and storing a folder record associated with the renamed folder; determining a training folder within the account; retrieving a first plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder; retrieving a second plurality of message identifiers from the message server, each message having an identifier and being associated within the training folder; detecting a trained message identifier included in the second plurality of messages and not included in the first plurality of messages; retrieving metadata associated with the trained message identifier; and storing a training record, the training record having a folder identifier associated with the training folder and metadata associated with the trained message metadata.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of various aspects of the invention and embodiments thereof, reference should be made to the detailed description below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures.

FIG. 1 is a network block diagram showing an exemplary electronic message processing system coupled to existing email systems.

FIG. 2 is a system block diagram showing an illustrative message processing server for use in the electronic message processing system of FIG. 1.

FIG. 3 is a system block diagram showing an illustrative account server for use in the electronic message processing system of FIG. 1.

FIGS. 4A-D are diagrams of illustrative database records for use by the electronic message processing system of FIG. 1.

FIG. 5 is a flowchart showing an illustrative method of configuring an account for use in an electronic message processing system.

FIG. 6 is a flowchart showing an illustrative method of processing electronic messages.

FIG. 7 is a flowchart showing an illustrative method of training an electronic message processing system.

FIG. 8A is diagram of an illustrative data structure for use by the electronic message processing system of FIG. 1.

FIGS. 8B, 8C, and 8D are flowcharts of illustrative methods for use within the electronic message processing system of FIG. 1.

FIG. 9A is diagram of an illustrative data structure for use by the electronic message processing system of FIG. 1.

FIGS. 9B and 9C are flowcharts of illustrative methods for use within the electronic message processing system of FIG. 1.

FIGS. 10A and 10B are diagrams of illustrative data structures for use by the electronic message processing system of FIG. 1.

FIGS. 10C and 10D are flowcharts of illustrative methods for use within the electronic message processing system of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

Before describing the present invention, some introductory concepts and terminology are explained. As used herein, a computer system “user” is any person or machine that interacts with the computer system. As used herein, the term “electronic message” means any electronic communication that is sent by at least one user (the sender) to at least one user (the recipient); the sender and the recipient may be the same user or different users. As used herein, the terms “process” and “application process” mean any computing task that is currently executing, or scheduled to execute, on a computer processor. The term “parent process” means a process that created/spawned at least one other process and the term “child process” means a process that was created/spawned by another process. As used herein, the term “metadata” is used to refer to any portion of an electronic message other than the message body and may include any/all email headers as described in RFC 2822, which is incorporated herein by reference in its entirety. The terms “metadata” and “headers” may be used synonymously herein. The term “folder” is used herein to refer to a grouping of email messages upon an email server. The terms “folder” and “mailbox” may be used interchangeably herein.

Reference will sometimes herein be made to specific versions and extensions to the IMAP protocol. Such protocols and extensions are described in several Request For Comments (RFCs), including RFCs 1730, 1731, 1734, 2060, 2086-2088, 2177, 2180, 2192, 2195, 2342, 2359, 2449, 2595, 2831, 2919, 2971, 3348, 3501, 3502, 3516, 3691, 4314, 4315, 4466-4469, 4550, 4551, 4731, 4959, 4978, 5032, 5092, 5161, 5162, 5182, 5228, 5255-5258, 5321, 5423, 5464, 5465, 5530, 5593, 5703, 5738, 5788, 5819, 5957, 6154, 6203, and 6237, each of which is available at http://www.ietf.org/rfc.html and hereby incorporated by reference in its entirety.

Reference will sometimes herein be made to the Exchange Web Services (EWS) protocol. A description of EWS is available at http://msdn.microsoft.com/en-us/library/exchange/bb204119.aspx, which is hereby incorporated by reference in its entirety.

Reference will sometimes herein be made to the Simple Mail Transfer Protocol (SMTP). A description of SMTP is available at http://tools.ietf.org/html/rfc5321, which is hereby incorporated by reference in its entirety.

Referring to FIG. 1, an electronic message processing system 114 is shown within an illustrative network environment. The system 114 may include a message processing server 100 and an account server 112, as shown. The illustrative network environment further includes a plurality of email servers 102, a plurality of mail transport agents (MTAs) 104, and a plurality of user computing devices 106. Although three (3) email servers 102 and three (3) MTAs 104 are shown in FIG. 1, the present system is compatible with any number of email servers and MTAs. The message processing server 100, the MTAs 104, and the computing devices 106 may be configured to connect to and communicate with the email servers 102 via a network 110. A user 108 may interact with the plurality of computing devices 106 and corresponding email client applications 106 a, as shown. For ease of explanation, the user computing devices 106 and respective client applications 106 a will sometimes herein be referred to as “clients.” The account server 112 may be coupled to the message processing server 100 and to the plurality of user computing devices 106 via the network 110. The message processing server 100 and account server 112 are discussed further below in conjunction with FIGS. 2 and 3, respectively.

The network 110 may be any suitable local-area network (LAN) or wide-area network (WAN) connection, including the Internet. It will be appreciated that the plurality of email servers 100-102, MTAs 104, and clients 106 may be connected to the network 110 using any suitable wired or wireless type of connection.

Each of the email servers 102 can be any suitable computing platform capable of running an email server application, which includes personal computers (PC), a rack-mounted server hardware, and a virtual host in a cloud computing environments. Each email server application can be any software that is configured to receive inbound email from a MTA, such as MTA 104, and providing certain email retrieval capabilities (described in detail below in conjunction with FIG. 2). As is known in the art, most email server applications 102 a implement at least one standardized protocol for email retrieval, such as Exchange Web Services (EWS) and/or IMAP. Thus, by supporting a relatively small number of standardized protocols, the present invention is compatible with most existing email servers, including proprietary servers, such as Microsoft Exchange™, and open-source email servers, such as Dovecot.

Each of the mail transport agents (MTA) 104 may be any suitable hardware and/or software configured to deliver inbound email to one or more email server 102 and to act as a relay between a sender's computer/email application and the destination email servers 102. As those skilled in the art should appreciate, each MTA 104 may represent a plurality of MTAs wherein intermediate MTAs are “chained” together and the MTA 104 represents only the end of the “chain.” Typically, an email server 102 will also implement SMTP, thus allowing it to receive inbound email from the MTA 104.

As shown in FIG. 1, the user computing devices 106 may have various types and form factors, and non-limiting examples include desktop computers, notebook computers, mobile phones, smartphones, tablet computers, and wearable computers. Each computing device 106 may include an email client 106 a, which is typically a software application configured to receive email message information (e.g. headers and/or body) from an email server 102 and that message information to a user 108. Each email client 106 a may be a standalone application which the user may install on a computing device or a web application which is hosted on a web server and accessed via a web browser. Thus, the email clients 106 a may include webmail services such as Yahoo! Mail™, desktop applications such as Microsoft Outlook™ and Eudora™, and mobile applications such as the Gmail™ application available on many smartphones and tablet computers. Thus, it should be appreciated that the present invention is compatible with many existing email clients.

Referring now to FIG. 2 in which like elements of FIG. 1 are shown having like reference designations, a message processing server 100 may include a CPU 200, a memory 202, a disk 204, and a network interface 206, all of which are coupled together via a communications bus 216. The message processing server 100 may be connected to a plurality of email servers 102 (shown in FIG. 1) via network interface 206. The message processor server 100 may be part of any suitable computing platform, including a personal computer (PC), a rack-mounted server, and a virtual host in a cloud computing environment.

The message processing server 100 may include an operating system (OS) 208 that is configured to access the memory 202, the disk 204, and the network interface 206. The OS 208 may be any suitable operating system, including Linux, BSD, OSX, and Windows. A database module 210, a communications module 212, and a message processing module 214 (collectively referred to herein as “the modules”) interact with the OS 208 and thus may have (indirect) access to the memory 202, the disk 204, and the network interface 206.

Each of the modules 210-214 will be described more fully herein below, however it should first be noted that each of the modules generally represent certain functionality that can be implemented in software. Those skilled in the art will therefore appreciate that the modules 210-214 can be provided in several forms, including as standalone applications, a plurality of software libraries (either statically or dynamically linked), compiled executable code, and/or a plurality of interpreted source code files.

In one embodiment, each of the modules 210-214 is included within a common daemon application, the OS is capable of multiprocessing (i e running multiple concurrent application processes), and a plurality of daemon application processes may be run concurrently within the message processing server 100. A parent daemon application process (“parent process”) may be provided to spawn and manage a plurality of child daemon application processes (“child process”). The parent process can be launched either manually by a user or automatically when the server 100 boots up. The parent process may spawn/launch (e.g. using the Linux “fork” system call) a plurality of child processes, each of which utilized some/all of the functionality provided by the modules 210-214. The parent process may delegate work to any of the child processes, may coordinate work among the child process, and may manage the child process lifecycles. In one embodiment, the message processing server operates on a plurality of user email accounts and each user email accounts is assigned to and operated on by one of the plurality of child processes. In certain embodiments, the parent process and/or the child processes may be multithreaded.

The database module 210 may be configured to operate on structured data (records) and to read and write records onto a nonvolatile memory device, such as disk 204. The various types of records for use within the database module 210 are collectively known as “the schema” and may include an email account record, a folder record, a training record, and a processed message record, each of which is described below in conjunction with FIGS. 4A-4D. In one embodiment, the database module 210 includes and/or utilizes a Relational Database Management System (RDBMS). It should be appreciated that certain RDBMSs, such as MySQL™, provide a standalone server application and a client library configured to communicate with the server application. However, certain other RDBMSs, such as SQLite, are provided as standalone libraries which can be embedded within an application. Thus, in certain embodiments the database module 210 may include a server application and a client library, whereas in other embodiments, it may include just a client library. The database module 210 may further include an encryption library capable of performing symmetric encryption and decryption on blocks and/or streams of data. In certain embodiments, the database module 210 stores data records in an unstructured database, such as flat files or a key/value store.

The database module 210 may provide a high-level record management interface to the other modules 212-214. For example, the database module 210 interface may include the standard Create, Read, Update, and Delete (CRUD) operations for each type of record included in the schema. As part of these operations, the database module 210 may perform a plurality of sub-operations including, but not limited to, validating untrusted data, encrypting/decrypting sensitive data, and providing notifications that a record was accessed, modified, or deleted. In one embodiment, the data module 210 includes and utilizes an Object Relational Mapping (ORM) library such as Hibernate (Java) or ActiveRecord (Ruby) which may provide CRUD operations and at least some of the sub-operations listed above. It should therefore be appreciated that the database module 210 may encapsulate relatively low-level database operations within a high-level interface that can be used other modules 212-214.

The communications module 212 may be configured to communicate with each of the plurality of email servers 102 using network interface 206 via the operating system 208 and the bus 216. The network interface 206 may be a hardware-based network interface card (NIC) or a virtual network interface, such as may be provided in a cloud computing environment. In one embodiment, the network interface 206 is an Ethernet adapter. The communications module 212 may include networking libraries that implement various Internet protocols/layers, such as ARP, IP, DNS, TCP, SSL, HTTP, and SOAP in addition to several email server retrieval protocols, including IMAP and EWS. The communications module 212 may also include data formatting libraries, such as an XML builder/parser library and text manipulation libraries.

The communications module 212 may provide a high-level interface that the other modules 212-214 can use to interact with the email servers 102. The communications module 212 may include adapters for a plurality of standard email retrieval protocols and thus provides a high-level unified interface to many existing email servers. In certain embodiments, the module 212 includes an IMAP adapter that is compatible with IMAP Versions 2 and 4, and may be configured to take advantage of several IMAP extensions, including the UIDPLUS Extension, the IMAP4 IDLE command, the IMAP List Extension for Special-Use Mailboxes, the Multimailbox Search Extension, the Extension for Fuzzy Search, COMPRESS Extension, and the IMAP Metatdata extension. In further embodiments, the communications module 212 includes an EWS adapter that is compatible with Exchange Server 2007, 2010, 2013, and all other Exchange Server versions that include a web services API.

In one embodiment, the communications module interface includes the commands shown in first column of TABLE 1. As shown, an IMAP adapter may execute the IMAP commands shown in the second column of TABLE 1 in response to corresponding interface commands. Further, an EWS adapter may execute the EWS commands shown in the third column of TABLE 1 in response to corresponding interface commands. It should be appreciated that certain commands shown may return a large amount of data, and thus in certain embodiments, batching techniques may be used to limit the size of data transfers between the message processing server 100 and an email server 102 (FIG. 1).

TABLE 1 Interface Command IMAP Commands(s) EWS Commands(s) StartSession(host, port, Open TCP/IP connection to host, Open HTTP connection to username, password) port. host, port using NTLM Auth CAPABILITY LOGIN user password RetrieveFolderList( ) LIST “*” FindFolder CreateFolder(folderId) CREATE folderId CreateFolder folderId DeleteFolder(folderId) DELETE folderId DeleteFolder folderId RetrieveNewMessageHeaders SELECT folderId itemIds = FindItem folderId, (folderId, lastMessageUid) uid >= lastMessageUid FETCH lastMessageUid:* GetItems itemIds BODY.PEEK[HEADER.FIELDS (MESSAGE-ID FROM . . .)] CopyMessages(sourceFolderId, SELECT sourceFolderId itemIds = FindItem messageUids, sourceFolderId messageUids targetFolderId) COPY messageUids CopyItem itemIds, targetFolderId targetFolderId MoveMessages(sourceFolderId, SELECT sourceFolderId itemIds = FindItem messageUids, sourceFolderId messageUids targetFolderId) COPY messageUids CopyItem itemId targetFolderId targetFolderId STORE messageUids + FLAGS DeleteItem itemIds (\DELETED) EXPUNGE DeleteMessages(folderId, SELECT folderId itemIds = FindItem folderId messageUids) messageUids STORE messageUids + FLAGS DeleteItem itemIds (\DELETED) EXPUNGE EndSession( ) LOGOUT Close HTTP connection. Close TCP/IP connection.

As should be appreciated by those in the art, certain existing email servers/services may purport to implement a standard mail retrieval protocol (e.g. IMAP), however it is not uncommon for such servers/services to fail to implement the entire protocol, or to implement portions of the protocol incorrectly. Thus, in certain embodiments, the communications module 212 includes patch code that allows a corresponding protocol adapter workaround such deficiencies, and thus allows the message processing server 100 to communicate with otherwise incompatible email servers. Alternatively, such patch code could be included within the message processing module 214. The communications module 212 and/or messaging processing module 214 may determine whether to use patch code based on one or more of the email servers attributes, such as the email server host, capabilities reported by the email server protocol (e.g. using the IMAP “CAPABILITY” command), or observed email server behavior.

The message processing module 214 may be coupled to both the database module 210 and the communications module 212 (directly and/or via the OS 208), and may be configured to operate upon a plurality of user email accounts. In certain embodiments, the message processing module 214 can determine the plurality of user email accounts by fetching a list of email account records (as shown in FIG. 4A) from the database module 210. The message processing module 214 operates upon each user email account by performing various useful functions, which are described below in conjunction with FIGS. 5-7. Suffice it to say here, the message processing module 214 can operate upon messages stored upon an email server using the communications module 212 interface and can operate upon database records using the database module 210 interface.

Referring now to FIG. 3, an account server 112 for use in the present invention is shown. The account server may include a CPU 300, memory 302, a disk 304, and a network interface 306, all of which are coupled together via a communications bus 318. In certain embodiments, the account server 112 and the message processing server 110 may share a common physical or virtual computing platform and therefore the CPU 300, the memory 302, the disk 304, and the network interface 306 shown in FIG. 3 may be the same as the CPU 200, the disk 204, and the network interface 206 shown in FIG. 2, respectively. In another embodiment, the servers 100 and 112 may exist on separate physical computing platforms. In yet another embodiment, the servers may be separate virtual computing platforms that run upon a common physical computing platform.

The account server 112 may include an operating system (OS) 308 that is configured to access the memory 302, the disk 304, and the network interface 306. The OS 308 may be any suitable operating system discussed above in conjunction with the message processing server OS 208. The account server includes a database module 310 and a communications module 312 (collectively referred to herein as “the modules”) that may be the same as or similar to the message processing server database module 210 and communications module 212, respectively. The account server further includes an account controller 314 coupled to both the database module 310 and the communications 312, and a graphical user interface (GUI) 316 that is coupled to the account controller 314.

As discussed above in conjunction with the message processing server, the modules 310 and 312, the account controller 314, and the GUI 316 generally represent certain functionality that can be implemented in software and it should be appreciated that they can be provided in several different forms. In certain embodiments, the message processing server 100 and the account server 112 may be a common virtual or physical computing platform, and thus message processing server OS 208 may be the same as the account server OS 308. In addition, the database module 210/310 and communications module 212/312 may be shared libraries that are used by both a message processing server application process and an account server application process.

In one embodiment, the modules 310 and 312, the account controller 314, and the GUI 315 are bundled together as a web application that executes inside a web application server/container. The web server/container may process concurrent requests using multithreading, event-driving loops, and/or multiple processes. Non-limiting examples of suitable web servers/containers include Apache HTTP Server, Apache Tomcat, WebSphere, Phusion Passenger, and Node.js.

In certain embodiments, the account controller 314 is coupled the message processing module 214 and therefore the account server 212 may provide notifications directly to the message processing service 200, such as notifying the message processing server when an email account is added, changed, or removed from the system. Any suitable type of inter-process communication may be used.

In certain embodiments, the database modules 212 and 312 can include and/or interact with a common RDBMS, which may be an embedded database (e.g. SQLite) or a standalone database (e.g. Postgres or MySQL). In one embodiment, the database modules 212 and 312 interact with a common database server which may runs on a separate computing platform (not shown in FIG. 2 or 3). In another embodiment, the message processing server 100 and the account server 112 are separate computing platforms and each have access to a shared disk 204/304 which may be a network-attached storage (SAN) device.

The account controller 314 and GUI 316 operate together to provide various email account management functions to a user 108 (FIG. 1). In certain embodiments, the GUI 316 includes a plurality of web pages which allow the user 108 to add, modify, and remove email accounts from the system. In one embodiment, the GUI 316 includes a web-based interface wherein a user may enter an email address, an email server address/host and port, a username, and a password. The account server 112 may, in turn, create a corresponding email account record (such as is shown in FIG. 4A) using the database module 210. The account controller may also notify the message processing server 100 that an account has been added and is ready to be configured, as discussed further below in conjunction with FIG. 5.

In one embodiment, the GUI 316 includes a streamlined web-based interface for adding a new account, wherein the user need enter only an email address and a password. The account controller 314 may, in turn, auto-discover any additionally required email server settings, including a suitable host, protocol, and port, the username, and whether a secure connection should be used. This auto-discovery process may be based on frequently used naming conventions. For example, an email account username is typically the same as, or similar to, the email address mailbox (i.e. the part of the address preceding the “@” symbol). Further, a suitable email server host can often be derived from the email address domain (i.e. the part of the address following “@” symbol), for example by prepending “mail.” or “imap.”. Moreover, by convention, port 143 is used for IMAP, port 993 is used for IMAP over TLS/SSL (IMAPS), port 80 is used for HTTP (i.e. web services), and port 443 is used for HTTP over TLS/SSL (HTTPS). In one embodiment, the account controller 314 may attempt to autodiscover secure server settings before insecure settings. Thus, it should be appreciated that many combinations of prospective email server settings can be derived for use in the autodiscovery process. For example, if a user enters the email address “jane@nineco.com”, the account controller 314 may choose to try certain combinations of the host names “nineco.com”, “mail.nineco.com”, and “imap.nineco.com”, the IMAP and EWS protocols, the ports 993, 143, 80, and 443, as shown in TABLE 2.

An iterative auto-discovery process may be used wherein the controller 314 may choose a first combination of settings and then attempt to establish a mail session based on those settings. If the account controller successfully establishes a mail session, the auto-discovered settings and user-entered password can be stored in a new email account record 400 (FIG. 4A) for use by the message processing server 100. Otherwise, a new combination of email server settings may be chosen and the autodiscovery process may be repeated. Several combinations of settings may be tried in parallel to reduce processing time. If none of the chosen combinations lead to a successful session, the account controller 314 (using GUI 316) may prompt the user to enter any necessary email server settings.

TABLE 2 Combination Server Host Protocol Port Secure? Username 1 nineco.com IMAP 993 true jane 2 nineco.com IMAP 143 false jane 3 mail.nineco.com IMAP 993 true jane 4 mail.nineco.com IMAP 143 false jane 5 imap.nineco.com IMAP 993 true jane 6 imap.nineco.com IMAP 143 false jane 7 nineco.com EWS 443 true jane 8 nineco.com EWS 80 false jane 9 mail.nineco.com EWS 443 true jane 10 mail.nineco.com EWS 80 false jane 11 ews.nineco.com EWS 443 true jane 12 ews.nineco.com EWS 80 false jane

In certain embodiments, the account controller 314 may further include a lookup table of email server settings for popular email service providers, including Yahoo Mail, Gmail.

In certain embodiments, the account controller 314 and GUI 316 may provide additional account management features to the user, including the ability to update an email account record (e.g. change the account password), delete/disable an email account record, create/update/delete training records, and view message processing statistics.

Referring now to FIGS. 4A-4D, several database records types 400-406 for use in the present system are shown. The records types 400-406 may collectively herein be referred to as the “schema.” Each database record type 400-406 represents a data structure having a set of attributes, such as attributes 400 a-400 g shown in FIG. 4A. Any or all of data structures 400-406 may be used with within a message processing server and an account server, such as servers 100 and 112 in FIG. 2, The message processing server 100 and/or account server 112 (FIG. 1) may include a plurality of database records, which can be stored within volatile memory and/or stored a disk, and each of the database records may have a structure corresponding to one of the record types 400-406.

In certain embodiments, the database module 210/310 (shown in FIGS. 2/3) utilizes a relational database having a plurality of relations (commonly referred to as “tables”). Each table may correspond to one of the plurality of record types 400-406 and may have a plurality of columns, each column corresponding to one of the set of attribute names. Each table may further have a plurality of rows and each row may correspond to a database record of the same type.

Before describing the database record types 400-406 in further detail, some introductory concepts are explained. Most email servers organize messages hierarchically: an email server may include a plurality of email accounts; each email account may include a plurality of folders (sometimes referred to as “mailboxes” and/or “labels”); and each folder may include a plurality of messages. Further, an email server may be identified by a hostname/address and port, an email account may be identified by a username that is unique to the server, and a folder may be identified by a name/label or other identifier that is unique to the email account. Certain folders may be created automatically by the email server (e.g. “INBOX” and “Sent”), whereas other folders may be created by a user. In the present system, certain folders may be created automatically by a message processing server, as discussed further below in conjunction with FIG. 5.

Referring now to FIG. 4A, an email account record 400 may include attributes which allow a message processing server (such as processing server 100 in FIG. 1) to operate on a user's email account by initiating a mail retrieval session upon an email server 102 (FIG. 1). Each email account record 400 may include an account id 400 a, an email server host 400 b, a mail retrieval protocol 400 c, an email server port 400 d, a secure connection flag 400 e, a username 400 f, and a password 400 g. The account id 400 a may be an email address, a synthetic unique identifier (e.g. a UUID or a sequence number), or any other identifier unique to the present system. In certain embodiments, each email account record 400 may further include a user id attribute (not shown) which can be used to associate multiple email accounts belonging to an individual user. The email server host 400 b may be the network address (e.g. IP address) or a qualified network host name of the email server and the email server port 400 d may be a TCP port number associated with the email server application. The secure connection flag 400 b indicates whether a secure socket layer connection (e.g. TLS/SSL) should be used to communicate over the specified host 400 b and port 400 d.

The username 400 f may uniquely identify an email account within the email server and the password 400 g may be a corresponding authentication token. The password may be a passphrase, an encryption key, an OAuth token, or any other type of authentication token accepted by the email server. In certain embodiments, the username and/or password can be encrypted using any suitable symmetric encryption algorithm (e.g. Blowfish). The username and password may herein collectively be referred to as “authentication tokens.”

Referring now to FIG. 4B, a folder record 402 for use in the present invention may include an account id 402 a, a folder id 402 b, a validity 402 c, a last message id 402 d, and an importance 402 e, as shown. The account id 402 a may correspond to an email account record and thus may be used to associate a plurality of folder records 402 with an email account record 400 (i.e. provides a “many-to-one” association with an email account record). The folder id 402 b is any value that uniquely identifies the folder within the associated email account and may be the folder name/label used upon the email server. The validity 402 c may correspond to a folder validity value provided upon the email server and may be used to detect folder renames and/or used to determine if the last message id value is valid, as discussed below with FIG. 6. The last message id 402 d may be a unique identifier corresponding to the last message processed by a message processing server in the folder, or blank of no messages have been processed yet. Wherein the associated email account protocol is IMAP, the last message id 402 d can be the Unique Identifier (UID) Message Attribute and the validity 402 c can be the IMAP folder UIDVALIDITY. As discussed further below in conjunction with FIG. 6, the importance 402 e may be used by a message processing server to decide if an inbound message should be automatically moved to the associated folder upon the email server. The importance level can be a number (e.g. 0, 1, 2) or a symbol (e.g. “high,” “medium,” and “low”).

Referring now to FIG. 4C, a training record 404 for use in the present invention may include an account id 404 a, a key 404 b, a value 404 c, an action 404 d, and a create time 404 e, as shown. The account id 404 a may correspond to an email account record account id 400 a, and thus may be used to associate a plurality of training records 404 with an email account record 400 (i.e. provides a “many-to-one” association.). The key 404 b may be any message header field, including, but not limited to, “Sender”, “From”, “Subject”, “To”, “cc”, “bcc”, “Delivered-To”, “List-Id”, “Message-ID”, “Resent-Message-ID”, “In-Reply-To”, “Resent-To”, “Resent-cc”, “Resent-bcc”, “Return-Path”, “Content-Type”, and “X-Autoreply” and the value 404 c may be the header value, or derivation thereof, associated with that header field. Alternatively, the key 404 b may be a symbol that represents a combination of several headers. For example, the key “sender” may be used to represent a combination of headers that may identify a sender, as discussed below with FIGS. 5-7. The action 404 d may provide instructions for processing inbound messages which match the key 404 b and value 404 c, and may be provided in any suitable format. In an embodiment, the action 404 d may be an importance level and may indicate that matching messages should be moved to the folder associated with the corresponding importance level (i.e. the folder associated with a folder record having an “importance” attribute which matches the training “action” attribute). In certain embodiments, the action 404 d may be domain-specific language (DSL). The create time 404 e may indicate the time the training action was detected and/or the time the training record was created. The create time 404 e may be used to resolve training conflicts, as discussed below in conjunction with FIG. 6. Training records may be created in response to a direct user action, in response to indirect user action, or automatically based on the message processing methods described below in FIGS. 5 and 7.

Referring now to FIG. 4D, a processed message record 406 for use in the present invention may include an account id 406 a, a message id 406 b, and a plurality of destination folders ids 406 c, as shown. The account id 406 a may correspond to an email account record account id 400 a, and thus may be used to associate a plurality of processed message records 406 with an email account record 400 (i.e. provides a “many-to-one” association). The message id 406 b can be any message identifier that is unique within the associated email account. In an embodiment, the message id 406 b may be the “Message-ID” header value, as described in RFC 2822. However, it should be appreciated that some email messages have a blank or missing “Message-ID” header value and thus, in certain embodiments, a surrogate identifier may be used instead. For example, a surrogate identifier can be created by concatenating certain other message header values. Each of the plurality of destination folders ids 406 c may correspond to a folder record folder id 402 b and thus may be used to associate a processed message record 406 with a plurality of folder records 402.

It should be appreciated that each record type 400-406 may include additional attributes not shown in FIGS. 4A-4D. For example, each record type 400-406 may include a create timestamp and/or an update timestamp (not shown) that indicate the time a record was created and last updated, respectively.

Referring now to FIGS. 5-7, it should be appreciated that these flowcharts correspond to the below contemplated techniques and would be implemented in a computer system, or more specifically, a message processing system 114 (FIG. 1). Rectangular elements (typified by element 502 in FIG. 5), herein denoted “processing blocks,” represent computer software instructions or groups of instructions. Diamond shaped elements (typified by element 612 in FIG. 6), herein denoted “decision blocks,” represent computer software instructions, or groups of instructions, which affect the execution of the computer software instructions represented by the processing blocks.

Alternatively, the processing and decision blocks represent steps performed by functionally equivalent circuits such as a digital signal processor circuit or an application specific integrated circuit (ASIC). The flow diagrams do not depict the syntax of any particular programming language. Rather, the flow diagrams illustrate the functional information one of ordinary skill in the art requires to fabricate circuits or to generate computer software to perform the processing required of the particular apparatus. It should be noted that many routine program elements, such as initialization of loops and variables and the use of temporary variables are not shown. It will be appreciated by those of ordinary skill in the art that unless otherwise indicated herein, the particular sequence of blocks described is illustrative only and can be varied without departing from the spirit of the invention. Thus, unless otherwise stated the blocks described below are unordered meaning that, when possible, the steps can be performed in any convenient or desirable order.

Referring to FIG. 5, an exemplary method 500 of configuring an email account for use in the present system is shown. In one embodiment, the method described herein may be performed by a message processing server 100 and implemented within a message processing module 214 (FIG. 2). However, in another embodiment, the method may be performed, at least in part, by an account server 112 and implemented within an account controller 314 (FIG. 3).

First, an email account record is fetched 502 from a database using a database module 210 (FIG. 2). The email account record may have the same or similar structure as record 400 in FIG. 4A. The email account record, which is associated with an email account, may have been previously created/stored by an account server in response to user actions, as described above in conjunction with FIG. 3. In certain embodiments, the email account record authentication tokens may be symmetrically encrypted and, thus, the next step of the process may be to decrypt 504 authentications tokens. Using the email server settings and decrypted authentication settings from the email account record, a session can be established 506 upon a suitable email server using a communications module 212 (FIG. 2).

Next, a list of existing folder ids associated with the email account may be retrieved 508 using the communication module 212, as shown.

The message processing server 100 may proceed to create 510 a plurality of default folders based upon a list of default “importance” levels and a folder id/name corresponding to each level. Each default importance level can be a number (e.g. 0, 1, 2) or a symbol (e.g. “high,” “medium,” and “low”) and each corresponding folder id can be any folder id that is valid within email account. In one embodiment, the present system includes a default importance level “high” and a corresponding to a folder id “INBOX.” The server 100 may compare the list existing folder ids to the list of default importance folder ids and create the default importance folders that do not yet exist 510 using the communications module 212.

Next, the message processing server 100 may store/create 512 a plurality of folder records, each folder record corresponding to a folder within the email account. Each folder record may have the same or similar structure to record 402 shown in FIG. 4B. In particular, each folder record may have an “account id” attribute corresponding to the email account record “account id” attribute. Folder records that correspond to default importance folders may have a “folder id” attribute corresponding to the default importance folder id and an “importance” attribute corresponding to the default importance folder importance level.

Still referring to FIG. 5, the message processing server 100 may next determine 514 a plurality of folder ids corresponding to folders that predominately include outbound email, herein referred to as “sent folder ids.” As disclosed herein, various techniques may be employed to determine the sent folder ids. As will be appreciated be those in the art, most email accounts include at least one folder into which outbound email (that is email sent by the account's user) is copied, either by the user's email client or by email server. Moreover, certain folder ids/names are common given to the sent folder, including as “Sent” and “Sent Mail.” Thus, according to one technique, the message processing server 100 may determine the plurality of sent folder ids by matching (e.g. using regular expression pattern matching) each of the retrieved folder ids to each of the common sent folder ids. According to another technique, the message processing server 100 may determine the sent folder ids by searching for folders associated with the mail account that include a high percentage of emails sent by the user. For example, the server 100 could retrieve a list of all message ids within a folder having a “FROM” address associated with the user's email account and compare the size of this list against the total number of messages within the folder; the server 100 could repeat this process for several/all of the folders associated with the account. According to yet another technique, the sent folder id may be provided by the user 108 via the account server 112 (FIG. 1).

Next, using the sent folder ids previously determined, the message processing server 100 can retrieve 516 recipient headers for a plurality of messages within the sent folders using the communications module 212. In certain embodiments, headers for all messages may be retrieved. However, to reduce the time required to configure a new account, in other embodiments only a sample of messages may be retrieved and analyzed as described herein. Such a sample can be based upon a maximum number of messages, a message date range, or any other suitable criteria. The recipient headers may include headers that identify the recipient of a message, including, but not limited to, “To”, “cc”, “bcc”, “Delivered-To”, and “In-Reply-To.”

Having retrieved certain headers for a plurality of sent messages, the message processing server 100 can proceed to determine 518 an importance level for each corresponding message recipient using any suitable technique/heuristic. According to one technique, each recipient is assigned the same importance level as every other recipient. According to another technique, frequency analysis may be employed wherein each recipient may be assigned an importance level based upon the total number of messages sent to that recipient. In another technique, recency analysis may be applied whereby a recipient of a more recently sent message may receive a higher importance level than the recipient of a less recently sent message.

Using the previously determined recipient importance level, the message processing server 100 may next store/create 520 a plurality of training records. Each training record may include an “account id” attribute corresponding to the email account “account id” attribute, a “key” attribute having a symbolic value (e.g. “sender”), a “value” attribute corresponding the recipient address and/or name, and an “action” attribute corresponding to the determined recipient importance level. Thus, it should now be appreciated that the method 500 described hereinabove uses certain techniques/heuristics to train the message processing system based upon the user's past behavior. Such training allows a message processing server to predictively filter inbound messages, as described below in conjunction with FIG. 6.

Finally, having configured the email account, the email server 100 may end 522 the email server session via the communications module 212.

Referring now to FIG. 6, an exemplary method of processing electronic messages 600 is shown. The method described hereinbelow can be performed by a message processing server 100 and implemented within a message processing module 214 (FIG. 2).

First, an email account record (such as record 400 in FIG. 4A) is fetched 602 from a database using a database module 210 (FIG. 2). The email account record, which is associated with an email account, may have been previously configured according to the method described above in conjunction with FIG. 5. Next, the email account record authentication tokens may be decrypted 604 and an email server session may be established 606 via a communications module 212 (FIG. 2).

Next, the message processing server 100 may fetch an Inbox folder record associated with the user's Inbox 608. The folder record may have the same structure as record 402 described above with FIG. 4B. In particular, the Inbox folder record may have a “last message id” attribute and a “validity” attribute. Wherein the last message id is an IMAP UID value, the message processing server 100 may additionally retrieve the current Inbox UIDVALIDITY value from the email server and disregard the folder record last message id if the folder record validity does not match the retrieved UIDVALIDITY (i.e. the last message id is no longer valid).

Having the last message id, the message processing server 100 can proceed to retrieve 610 headers for a plurality of unprocessed messages within the Inbox using the communications module 212. In one embodiment, the server 100 may retrieve the headers: “Sender”, “From”, “Return-Path”, “Delivered-To”, “To”, “In-Reply-To”, “cc”, “bcc”, “Subject”, “List-Id”, and “Message-ID”. If no headers are retrieved 612 (i.e. no unprocessed messages exist within the account Inbox), the message processing server 100 may shut down or wait for new messages to arrive, as discussed hereinbelow. Otherwise, the server 100 may process each of the unprocessed messages.

The message processing server 100 may select 614 the next unprocessed message for processing. First, the server 100 may fetch 616 a plurality of training records associated with an unprocessed message from the database using the database module 210. The training records may have a structure similar to or the same as record 404 in FIG. 4C. The training records may have been created automatically according to the method discussed above with FIG. 5, indirectly by the user according to the method discussed below with FIG. 7, or directly by the user via the account server 112 (FIG. 1). The server 100 may fetch training records based upon various criteria. For example, the message processing server 100 may fetch all records having the key “sender” and a value similar to any header that identifies the sender (e.g. “Sender”, “From”, and “Return-Path”), all records having the key “Subject” and a value similar to the unprocessed message “Subject” header, and/or all records having the key “List-Id” and a value similar to the unprocessed message “List-Id” headers.

Next, the message processing server 100 may determine 618 a plurality of actions to take upon the unprocessed message. In certain embodiments, each such action includes a plurality of target folders and an indication as to whether the message should be moved or copied to the target folders.

In certain embodiments, the message processing server 100 determines a plurality of actions to take based upon the plurality of training record “action” attributes. It should be appreciated that two or more of the fetched training records may have conflicting actions. For example, one training record may indicate that the message should be moved to a “high” importance folder, whereas a second training record may indicate that the message should be moved to a “low” importance folder. Thus, the message processing server 100 (more specifically, the message processing module 214) may include various methods for resolving training conflicts. According to one method, the server 100 may choose the action corresponding to the training record with the most recent “create time” attribute. According to another method, the server 100 may choose the action which appears most frequently among the fetched training records. In yet another method, the server may choose an action corresponding to a high importance level over an action corresponding to a low importance level. Any suitable conflict resolution method, or combination of methods, may be used within the present system.

The server 100 may further determine the actions to take based upon a plurality of shared rules provided within the message processing module 214. Similar to a training record, a shared rule may include key/value pair to match and an action to take upon such a match. Such rules can be global, meaning they apply to all email accounts within the system, or otherwise shared and applied across one or more accounts. Such rules may be included statically with the application, provided within a configuration file, and/or maintained within the database. The message processing server 100 may further include techniques to resolve conflicts between shared rules and training records, including any of the conflict resolution techniques described hereinabove.

If no training records and no shared rules match the unprocessed message, the message processing server 100 may apply a default action. In one embodiment, the default action is to move the message to a folder corresponding to a “low” importance level.

Next, the message processing server 100 can copy or move 620 the unprocessed message to the target folder ids using the communications module 212. It should be appreciated that any/all of the target folder ids may have been rendered invalid due to a user action, such as the user renaming a folder using an email client. Therefore, in one embodiment, the server 100 may determine if any of the target folder ids are invalid and, further, what the corresponding valid folder ids are (e.g. the new name of a renamed folder). In one embodiment, the server 100 may determine the new folder id by comparing the associated folder record “validity” attribute to a list of folder validity values retrieved from the email server. In another embodiment, the server 100 may determine the new folder id by periodically retrieving a list of folders from the email server and comparing the current list to the previous list.

In one embodiment, the message processing server 100 may aggregate (“batch”) certain operations that read or write from the email server to reduce the number of network operations and thus improve system efficiency.

Next, the message processing server 100 may store 622 a processed message record corresponding to the newly processed message. The processed record message may have the same or similar structure as record 406 in FIG. 6. In particular, the processed record message may have a message id associated with the newly processed message id and a plurality of folder ids associated with the plurality of target folders. As will be appreciated, the processed message records may serve several different purposes with the present system. In one respect, the processed message records can be used to allow a user to indirectly train the system, as discussed below in conjunction with FIG. 7. In another respect, the processed message record serves as a history of processing operations performed by the present system and therefore can be used to store messages to a user's Inbox upon request.

Next, the Inbox folder record “last message id” attribute may be updated 624 to correspond to the newly processed message and stored in the database via the database module 210. In certain embodiments, the Inbox folder record may be stored only periodically to reduce the number of database operations and thus improve system efficiency.

Having processed all messages in the user's Inbox, the message processing server 100 may either 626 shutdown or wait for new messages to arrive. In one embodiment, the server 100 may shutdown in response to a signal sent by an operator.

The message processing server 100 may use either a polling-based technique or an interrupt-based technique to wait 628 for new messages. In one embodiment, the server 100 uses the IMAP IDLE feature (as described in RFC 2177) to receive a notification from certain email servers that a new message has within the user's Inbox. In another embodiment, the server 100 checks for new mail periodically (i.e. polls) using the communications module 212.

Before the message processing server 100 shuts down, it may first end 630 the session upon the email server using the communications module 212. As discussed above with FIG. 2, the message processing server 100 may assign each email account to a separate process/thread, and thus only the corresponding process/thread may be terminated whereas any other server 100 processes/threads (including a parent process/thread) may continue running

It will now be appreciated that the method described hereinabove in conjunction with FIG. 6 provides various message processing capabilities, including predictive filtering, and is compatible with most existing email servers and email clients. In particular, the method may help users reduce the number of messages in their Inbox by automatically moving certain messages to other folders.

Referring now to FIG. 7, an illustrative method 700 of training a message processing system is shown. The method described hereinbelow can be performed by a message processing server 100 and implemented within a message processing module 214 (FIG. 2). It will be appreciated by those of ordinary skill in the art that the methods illustrated in FIGS. 6 and 7 can be performed by a single processor and/or system and, further, can be performed in parallel or serially.

First, an email account record (such as record 400 in FIG. 4A) is fetched 702 from a database using a database module 210 (FIG. 2). The email account record, which is associated with an email account, may have been previously configured according to the method described above in conjunction with FIG. 5. Next, the email account record authentication tokens may be decrypted 704 and an email server session may be established 706 via a communications module 212 (FIG. 2).

Next, a folder into which a user may train messages, herein referred to as a “training folder,” is selected 708. In general, any folder within the email account may be selected as a training folder and the method described herein may be repeated for several different training folders. In one embodiment, the present method may be repeated for all folders within the email account, thus allowing the user to train messages into any folder. However, it will be appreciated that some email accounts have a very large number of folders, and therefore it may be impractical to operate upon all such folders. Thus, in one embodiment, only folders associated with an importance level (as discussed above in conjunction with FIGS. 4B and 5) are selected to be training folders.

Next, the message processing server 100 may retrieve 710 a plurality of message ids within with the training folder using the communications module 212. Further, the server 100 may fetch 712 a plurality of processed message records using the database module 210, wherein each of the processed message records may have a similar structure to record 406 of FIG. 4D and a folder id associated with the training folder.

Next, the server 100 may determine 714 a plurality of trained message ids by comparing the retrieved message ids to the processed message record message ids. In one embodiment, the server can detect messages ids that are included in the retrieved messages ids but are not included in the processed message record id (i.e. messages that were copied to the training folder by a user).

Next, the message processing server 100 may retrieve 716 certain headers associated with the plurality of trained message identifiers using the communications module 212. In one embodiment, the retrieved headers include all headers that may identify the message sender, including “Sender”, “From”, and “Return-Path.”

Next, the server 100 may create/store 718 a training record corresponding to each of the plurality of trained messages. Each training record may have the same or similar structure to record 404 of FIG. 4C. Specifically, each training record may have a “key” attribute corresponding to one of the header names and/or symbol and a “value” attribute which corresponds to one of the header values, or a derivation of one or more of the header values. In one embodiment, each training record key is “sender” and value is a combination and/or derivation of headers that may identify the message sender.

Finally, the message processing server may end 720 the session upon the email server using the communications module 212.

It will now be appreciated by those learned in the art that the method described in FIG. 7 allows a user to indirectly train the present system by moving or copying a message into a folder upon an email server and is therefore compatible with existing email servers and clients and does not require any new or special user interface.

Moreover, it should be appreciated that the systems and methods disclosed above function without needing to download, inspect, or otherwise read the body of any message and therefore provide a high level of privacy to users.

FIGS. 8A-8D illustrate a feature of a message processing system whereby a user can receive a notification (“reminder”) if the user sends a message but does not receive a reply to that message within a designated time period.

Referring now to FIG. 8A, an illustrative data structure 800 may be used within a message processing server 100 and/or within a database (e.g., a relational database) coupled thereto. The data structure 800 can be used to track pending reminders, whereby each instance of the data structure 800 corresponds to a message for which the user requested a reminder. Accordingly, data structure 800 is also referred to herein as reminder record 800. A reminder record 800 may include an account id 800 a, a message id 800 b, a subject 800 c, recipients 800 d, a reminder time 800 e, a replied-at timestamp 800 f, and an active flag 800 g.

The account id 800 a associates the reminder with an email account record 400 (FIG. 4A). The message id 800 b uniquely identifies the to-be-reminded-of message within the user's email account—examples of message id formats that can be used are described above in conjunction with attribute 406 b of FIG. 4D. In some embodiments, the message processing server (and/or a database coupled thereto) imposes a uniqueness constraint on the combination of account id 800 a and message id 800 b. The subject 800 c is the subject is of the to-be-reminded-of message. Recipients 800 d identifies the recipients of the to-be-reminded-of message and may be, for example, a formatted list of recipient email addresses.

The reminder time 800 e indicates the date and/or time at which the reminder should be delivered (i.e., when the reminder is “due”). The replied-at timestamp 800 f indicates the time at which a reply was received; an empty/blank replied-at timestamp 800 f may indicate that a reply has not yet been received. The active flag 800 g indicates whether the reminder is active or inactive. A reminder may become inactive for various reasons, including but not limited to: a reminder is delivered to the user; the recipient replies to the to-be-reminded-of message; or the user sends a follow-up message. As used herein, the term “follow-up message” refers to a message that is sent after the to-be-reminded-of message, that is sent to the same recipient as the earlier sent message, and that is somehow related to the earlier sent message (e.g., is a reply to the earlier message, references the earlier message, or has a subject that matches the earlier sent message). In an alternate embodiment, a reminder record 800 is deleted when it becomes inactive.

Referring to FIG. 8B, an illustrative method 820 creates pending reminders by monitoring a user's sent folder. At block 822, an authenticated session for the user's email account is established with a designated email server 102. Block 822 can be skipped if an active session is established with the appropriate email server, for example if any of methods 500 (FIG. 5), 600 (FIG. 6), or 700 (FIG. 7) are performed along with method 820.

At block 824, new messages to-be-reminded-of are identified within the user's sent folder. As described above in conjunction with FIG. 5, the sent folder can be determined during the account setup process and tracked via a folder record 402 (FIG. 4B). The folder may be selected (e.g., using IMAP “SELECT”) if it has not yet been selected. In some embodiments, messages to-be-reminded-of are identified by searching/scanning the sent folder for messages matching certain headers values or header value formats. In various embodiments, any message having a “TO,” “CC,” or “BCC” header with the format “reminder-time@reserved-domain,” is identified. Here, “reserved-domain” is an arbitrary domain name and “reminder-time” indicates the date/time at which a reminder should be sent. The reserved domain is typically a domain name associated with the message processing system to avoid collisions with “real” email addresses; multiple reserved domains could be used. The “reminder-time” may include textual representations of dates, times, and/or durations; non-limiting examples include “1week,” “5 minutes,” and “january1.” The message processing server 100 may include a library to parse such diverse date/time/duration formats. Those skilled in the art will understand that such libraries are widely available.

At block 826, the reminder times are parsed for each identified message (i.e., the messages identified at block 824). A message may include reminder time information within a header field. If a reminder time cannot be parsed, a default reminder time may be used (e.g., 1 day).

At block 828, a pending reminder is created or updated for each identified message (i.e., each message identified at block 824). In some embodiments, an illustrative reminder record 800 from FIG. 8A is created or updated for each of the identified messages. For a given identified message, the account id 800 a can be set to the id of the email server account (i.e., the account for which a session is established at block 822), the message id 800 b can be set to uniquely identify the message within the email server account, the subject 800 c can be set to the message's subject, recipients 800 d can be set to the recipients of the message (e.g., a formatted list of the recipients' email addresses), the reminder time 800 e can be set to the reminder time (from block 826), and the active flag 800 g can be set to true. In various embodiments, it is determined if a reminder record 800 already exists for the message and, if so, the existing record is updated.

In some embodiments, the system maintains a folder of messages for which pending reminders exist, referred to herein as the “reminders folder.” The reminders folder may have a default name (e.g. “RemindMe”), which the user can change as desired. The message processing server 100 may automatically add a message to this folder when a corresponding reminder record is created/activated, and automatically remove a message from this folder when a corresponding reminder record is deleted/deactivated. Advantageously, a user can view pending reminders using a conventional email client folder view. At block 830, the identified messages may be copied to the reminders folder. The reminders folder may be created if it does not exist, along with a corresponding folder record 402 (FIG. 4B). The folder record importance 402 e may be set to denote the folder's purpose. In some embodiments, the reminder folder is created as part of the setup process (e.g., as part of block 508-512 of FIG. 5).

At block 832, the session may be ended with the email server. Alternatively, the session could be kept open so that additional processing can be performed within the user's email account.

Referring to FIG. 8C, an illustrative method 840 deletes/deactivates pending reminders (e.g., reminders created via method 820 of FIG. 8B) by monitoring a user's mailboxes. As discussed above, a reminder may become inactive for various reasons. In this example, the method 840 deletes/deactivates a reminder if (1) a reply is received or if (2) the user sends a follow-up message.

At block 842, an authenticated session for the email account may be established with a designated email server 102, if necessary.

At block 844, newly received messages in the user's email account are retrieved from the email server. This may include fetching an inbox folder record 402 (FIG. 4B) associated with the email account, issuing a command to the email server to select the folder name associated with the inbox folder record, and issuing a command to the email server to retrieve header information for the new messages in the inbox folder (e.g., using a cursor). The retrieved header information may include “From,” “In-Reply-To,” “References,” and “Subject” header values for each new message.

At block 846, pending reminders for which a reply was received are identified. This may include extracting header values from each of the newly received messages (from block 844) and then searching for reminder records 800 associated with the user's account that match certain criteria. Non-limiting examples of criteria to match a reminder record 800 with a received message include: (1) at least one of the record's recipients 800 d matches the message's “From” header value, and the record message id 800 b matches the message's “In-Reply-To” or “References” header value; and (2) at least one of the record's recipients 800 d matches the message's “From” header value, and the record subject 800 c matches in whole, or in part, the message's “Subject” header value. In some embodiments, block 846 includes constructed and executing a SQL query.

At block 848, newly sent messages in the user's email account are retrieved from the email server. This may include fetching an sent folder record 402 (FIG. 4B) associated with the email account, issuing a command to the email server to select the folder name associated with the sent folder record, and issuing a command to the email server to retrieve header information for the new messages in the sent folder (e.g., using a cursor). In various embodiments, the retrieved header information includes the “To,” “In-Reply-To,” “References,” and “Subject” header values for each new message.

At block 850, pending reminders for which a follow-up message was sent are identified. This may include extracting header values from each of the newly sent messages (from block 848), and then searching for reminder records 800 associated with the user's account that match certain criteria. Non-limiting examples of criteria to match a reminder record 800 with a sent message include: (1) the record message id 800 b matches the message's “In-Reply-To” or “References” header value; (2) at least one of the record's recipients 800 d matches the message's “To” header value and the record subject 800 c matches in whole, or in part, the message's “Subject” header value. In some embodiments, block 850 includes constructed and executing a SQL query.

At block 852, the pending reminders identified at blocks 846 and 850 may be deleted/deactivated. In some embodiments, this includes deleting the corresponding reminder records 800 from the message processing server (or a database coupled thereto). In other embodiments, block 852 comprises setting a record to be inactive (e.g., setting active 800 g to false). If a reply was sent by the user, the replied at timestamp 800 f may be set to the current time.

At block 854, for each pending reminder deleted/deactivated at block 852, the original message may be deleted from the user's reminders folder. In some embodiments, this includes fetching the reminder folder record 402 (FIG. 4B) associated with the user's email account, issuing a command to the email server to select the folder name associated with the reminder folder record, issuing a command to the email server to determine the UIDs for messages corresponding to the deleted/deactivated reminders, and issuing a command to the email server to delete those UIDs.

At block 856, the session may be ended with the email server. Alternatively, the session could be kept open so that additional processing can be performed within the user's email account.

Referring to FIG. 8D, an illustrative method 860 identifies due reminders and delivers corresponding reminder notifications. In some embodiments, a reminder is delivered to a user by copying the original message to-be-reminded-of into the user's inbox. In other embodiments, a modified copy of the original message is generated and delivered to the user's inbox. In either case, a placeholder message may be delivered if the original message cannot be found.

At block 862, an authenticated session may be established for the email account with a designated email server, if necessary.

At block 864, due reminders for the user's email account are identified. In some embodiments, this includes searching for reminder records 800 (FIG. 8A) having an account id 800 a matching the email account id and a reminder time 800 e greater than or equal to the current time.

At block 866, the due reminders are delivered to the user. If the original message can be located (e.g., within the user's reminders folder, sent folder, or an archive folder), then the original message is copied to the user's inbox folder. This may include retrieving an inbox folder record associated with the email account, determine another folder in which the original message exists (the “source folder”), and issuing a command to the email server to copy the original message from the source folder to the folder name identified by the inbox folder record.

In certain embodiments, a modified copy of the original message is generated and delivered to the user's inbox. Content may be prepended (or appended) to the body of the original message. Such content may include controls (e.g., HTML links) that enable a user to generate another reminder for the same message. Different controls may correspond to different reminder times (e.g., 2 hours, 6 hours, 12 hours, 1 day, 2 days, 3 days, 1 week, 2 weeks, and 4 weeks). If a user activates such a control (e.g., clicks on an HTML link), a request is sent to the message processing server which in turn may generate and store a new reminder record 800 (FIG. 8A).

Still referring to block 866, if the original message cannot be located (e.g., if the user deleted the message), a placeholder message may be generated and added to the inbox folder (e.g., by issuing appropriate IMAP commands). The placeholder message may include information from the reminder record 800, such as the original message's subject 800 c and recipients 800 d.

At block 868, the due reminders identified at block 864 are deleted/deactivated. In the later case, the corresponding reminder records may be updated to set the reminder time 800 e and active 800 g to false. At block 870, messages within the user's reminder folder that are associated with the due reminders can be deleted.

At block 872, the session may be ended with the email server. Alternatively, the session could be kept open so that additional processing can be performed within the user's email account.

The methods 820, 840, and 860 or FIGS. 8B, 8C, and 8D, respectively, may be provided within a message processing system (e.g., message processing system 114 of FIG. 1) and, more particularly, within a message processing server (e.g., message processing server 100 of FIG. 2). In certain embodiments, the methods 820, 840, and/or 860 are provided within the message processing module 214 of FIG. 2.

It will be appreciated that the method 820 enables a user to easily create reminders using a conventional email client. When composing a new message, the user can add a specially formatted reminder address to the “CC” or “BCC” line. The reminder email address encodes the desired reminder date/time. Using method 820 (FIG. 8B), a message processing system can identify the message in the user's sent folder, generate and store a pending reminder, and (in some embodiments) copy the sent message to reminders folder. Advantageously, because the method 840 operates by monitoring the sent folder, reminders can only be created by an entity (e.g., the user) having access to the email account. If the user receives a reply to the original message or sends a follow-up message before the reminder date/time, the message processing system automatically deletes/disables the pending reminder using method 840 (FIG. 8C). Otherwise, when the reminder becomes due, the message processing system adds a reminder message to the user's inbox using method 860 (FIG. 8D), and may remove the original sent message from the reminders folder.

Using methods 820, 840, and 860, the message processing system also provides a convenient way for a user to defer reading/processing messages: the user can forward a message to a reminder address and the message will be copied back to the user's inbox folder at the specified date/time.

FIGS. 9A-9C illustrate another feature of a message processing system whereby a user can track replies to messages sent from their email account. When the user sends a message, the system automatically copies the sent message to a designated folder referred to herein as a “pending reminders folder.” If the user subsequently receives a reply to the sent message, it is automatically removes the sent message from the pending reminders folder.

Referring now to FIG. 9A, an illustrative data structure 940 may be used within a message processing server 100 and/or within a database (e.g., a relational database) coupled thereto. The data structure 940 can be used to track messages sent by a user for which replies are expected and/or have not yet been received. Accordingly, data structure 940 is also referred to herein as tracked sent message record 940. The illustrative tracked sent message record 940 includes an account id 940 a, a message id 940 b, a number of replies expected 940 c, a number of replies remaining 940 d, recipients 940 e, a subject 940 f, and an in-reply message id 940 g.

The account id 940 a associates the reminder with an email account record 400 (FIG. 4A). The message id 940 b uniquely identifies the to-be-reminded-of message within the user's email account—examples of message id formats that can be used are described above in conjunction with attribute 406 b of FIG. 4D. In some embodiments, the message processing server (and/or a database coupled thereto) imposes a uniqueness constraint on the combination of account id 800 a and message id 800 b.

The replies expected 940 c indicates the number of replies that are expected and may be determined based on the number of recipients on the original message (e.g., the number of unique email addresses identified in the “TO” header of the original message). The replies remaining 940 d indicates the number of expected replies that have not yet been received. In some embodiments, replies expected 940 c and replies remaining 940 d are initialized to the same value and, as replies are received, the value of replies remaining 940 d is decremented.

Recipients 940 e may correspond to the list of recipients on the original message (e.g., a list of unique email addresses identified in the “TO” header of the original message). Subject 940 f and in-reply to 940 g may correspond to the “Subject” and “In-Reply-To” header values, respectively, of the original message.

Referring to FIG. 9B, an illustrative method 900 automatically adds messages to a pending reply folder by monitoring a sent folder within the email account. At block 902, an authenticated session may be established for the email account at a designated email server 102. At block 904, the pending reply folder may be created if it does not already exist. In some embodiments, the pending reply folder is created as part of account setup process 500 of FIG. 5.

At block 906, newly sent messages in the user's email account are retrieved from the email server. This may include fetching an sent folder record 402 (FIG. 4B) associated with the email account, issuing a command to the email server to select the folder name associated with the sent folder record, and issuing a command to the email server to retrieve header information for the new messages in the sent folder (e.g., using a cursor). In various embodiments, “Message-Id” header values are retrieved.

At block 908, newly sent messages (from block 906) that are not in the pending reply folder are identified. In some embodiments, messages in the pending reply folder are tracked via corresponding processed message records 406 (FIG. 4D) and, thus, block 908 may include querying processed message records 406. At block 910, the messages identified at block 908 may be copied to the pending reply folder. In some embodiments, the process 900 also includes generating and storing a tracked sent message record 940 (FIG. 9A) in a database.

At block 912, the session may be ended with the email server. Alternatively, the session could be kept open so that additional processing can be performed within the user's email account.

Referring to FIG. 9C, an illustrative method 920 automatically removes messages from a pending reply folder within a user's email account by monitoring the inbox folder within the same email account. At block 922, an authenticated session may be established for the email account at a designated email server 102.

At block 924, newly received messages in the user's email account are retrieved from the email server. This may include fetching an inbox folder record associated with the email account, issuing a command to the email server to select the folder name associated with the inbox folder record, and issuing a command to the email server to retrieve header information for the new messages in the inbox folder (e.g., using a cursor). The retrieved header information may include “From,” “In-Reply-To,” “References,” and “Subject” header values for each new message.

At block 926, messages in the pending reply folder for which a reply was received are identified. This may include extracting header values from each of the newly received messages (from block 924), and then querying the database to find a tracked sent messages record 940 (FIG. 9A). In some embodiments, the “In-Reply-To” header of the newly received message is used to generate a message id, which can then be compared against the message id 940 b field (FIG. 9A) to find a matching tracked sent message 940. In certain embodiments, the process 920 further includes updating the tracked sent message record 940 to decrement the replies remaining 940 d. If all expected replies have been received (e.g., if replies remaining 940 d equals zero), the system may delete the tracked sent message record 940.

FIGS. 10A-10D illustrate a feature of the message processing system whereby a user can defer processing (or “hold”) a message until a later time. The mail processing system may create and/or monitor or more designated folders (referred to herein as “hold folders”) into which the user can place messages for holding. Each hold folder has a designated hold period, which indicates the duration of time messages in that folder are held. Using the hold periods, the system determines when the messages in each hold folder should be released. When a message is released, it may be re-processed if it had just been received (e.g., moved to the inbox folder or to an importance folder).

Referring to FIG. 10A, an illustrative processed message record 406′ is similar to processed message record 406 of FIG. 4B, but includes additional attributes used for the deferred messages feature. In particular, the processed message record 406′ includes an is-held flag 400 d to indicate if the corresponding message is currently being held, and a held-at timestamp 400 e indicating the time at which the message was held (e.g., the time at which the message was detected within the hold folder).

Referring to FIG. 10B, an illustrative folder record 402′ is similar to folder record 402 of FIG. 4B, but includes additional attributes used for the deferred messages feature. In particular, the folder record 402′ includes a hold period 402 f, a next release timestamp 402 g, and an is-hold-folder flag 402 h. The next release timestamp 402 g indicates the time at which the mail processing server should consider releasing messages in the corresponding hold folder. The is-hold-folder flag 402 h indicates whether the folder record corresponds to a hold folder.

In some embodiments, the mail processing system creates a default set of hold folders and corresponding folder records 402′ during the account setup process (e.g., as part of method 500 of FIG. 5). A hold folder may be assigned a default name (i.e., folder id 402 b) to indicate its hold period; if the user renames a hold folder, the system can automatically detect and begin monitoring the renamed folder (e.g., using techniques described above in conjunction with FIG. 6). In some embodiments, the message processing automatically creates a “Tomorrow” hold folder with a period of 1 day, and a “NextWeek” hold folder with a period of 1 week. In certain embodiments, the user can manually create hold folders via a user interface (e.g., a web page), specifying the folder id 402 b and hold period 402 f; in response, the system creates a folder record 402′ and a corresponding mailbox folder.

Referring to FIG. 10C, an illustrative method 1020 monitors the hold folders associated with a user's email account for newly held messages. The method 1020 may be performed periodically by a message processing server 100.

At block 1022, an authenticated session for the email account is established with a designated email server 102, if needed.

At block 1024, hold folders associated with the email account are determined. This may include querying folder records 402′ (FIG. 10B) having an account id 402 a matching the user's email account id and having an is-hold-folder flag 402 h set to true.

At block 1026, for each hold folder (from block 1024), newly held messages are identified. This may include (1) issuing a command to the email server 102 to select the folder id indicated by the corresponding folder record 402′; (2) issuing a command to the email server 102 to retrieve a list of message ids within the hold folder; (3) querying processed message records 406′ (FIG. 10A) to determine a list of already held message ids associated with the user's email account; and (4) comparing the list message ids within the hold folder to the list of already held message ids to determine the messages not currently being held.

At block 1028, for each newly held message (from block 1026), a corresponding processed message records 406′ is created/updated and stored. In some embodiments, the is-held flag 400 d is set to true and the held-at timestamp 400 e is set to the current time. In addition, the destination folder ids 406 c may be set/updated to indicate the message is in the corresponding hold folder. The processed message records 406′ may be stored to a database.

At block 912, the session may be ended with the email server. Alternatively, the session could be kept open so that additional processing can be performed within the user's email account.

Referring to FIG. 10D, an illustrative method 1040 releases messages that are being held within the hold folders of a user's email account.

At block 1042, a determination is made whether it is time to release messages in any of the hold folders. This may include searching for folder records 402′ (FIG. 10B) having an account id 402 a matching the user's email account id, an is-hold-folder flag 402 h set to true, and a next release timestamp 402 g less than or equal to the current time. If one or more such folder records are found, processing proceeds to block 1044. Otherwise, the method 1040 may wait (e.g., sleep, or yield to other processing) until it is time to release messages.

At block 1044, a folder from which to release messages is selected. This may be a folder associated with one of the folder records 402′ found at block 1042. If multiple folder records are found at block 1042, the selected folder may be the folder associated with the earliest next release timestamps 402 g.

At block 1046, messages in the selected folder are identified. This may include searching for processed message records 406′ (FIG. 10A) having an account it 406 a matching the email account id, destination folder ids 406 c indicating that the message is within the selected folder, an is-held flag 400 d set to true, and a held-at timestamp 400 e less than or equal the current time minus the selected folder's hold period (as indicated by the hold period attribute 402 f of the corresponding folder record 402′). For example, if the selected hold folder has a period of 1 day, any messages put in the selected folder at least 24 hours ago are identified at block 1046.

At block 1048, the identified messages (from block 1046) are reprocessed. In some embodiments, this corresponds to performing processing blocks 614-622 described above in conjunction with FIG. 6. Thus, for example, held messages that are important may be moved to the inbox folder, whereas held messages that are less important may be moved to a different folder.

At block 1050, processed message records 406′ may be updated to set the is-held flag 400 d to false. In some embodiments, the destination folder ids 406 c are also updated to indicate that the message is no longer in the hold folder.

At block 1052, the hold folder's folder record 402′ is updated by setting the next release timestamp 402 g. In some embodiments, the next release timestamp 402 g is calculated by adding the hold period 402 f to the current time. The process 1040 may be repeated in a loop, as shown.

Once given the above disclosure, many other features, modifications, and improvements will become apparent to the skilled artisan. Such features, modifications, and improvements are therefore considered to be part of this invention, without limitation imposed by the example embodiments described herein. Moreover, any word, term, phrase, feature, example, embodiment, or part or combination thereof, as used to describe or exemplify embodiments herein, unless unequivocally set forth as expressly uniquely defined or otherwise unequivocally set forth as limiting, is not intended to impart a narrowing scope to the invention in contravention of the ordinary meaning of the claim terms by which the scope of the patent property rights shall otherwise be determined. All references discussed and disclosed herein are hereby incorporated by reference in their entirety. 

What is claimed is:
 1. A method, comprising: connecting, from a message processing server, to an email account located on a remote message server, the email account associated with a user; determining one or more sent folders located on the remote message server and associated with the email account; retrieving, from the remote message server, header information for one or more sent messages located within the sent folders; identifying, from the sent messages, one or more messages to be reminded of based on the retrieved header information by: extracting one or more recipient email addresses from the retrieved header information, each of the recipient email addresses associated with a TO, CC, or BCC header; splitting each of the recipient email addresses into a mailbox portion and a domain portion; and identifying at least one of the recipient email addresses having a domain portion that matches a reserved domain name, wherein the reserved domain name comprises a domain name associated with the message processing server; determining, for each of the messages to be reminded of, a message id and a reminder time using the header information, wherein determining the reminder time for a message to be reminded of comprises converting the mailbox portion of the at least one recipient email address to the reminder time; for each of the messages to be reminded of, storing a pending reminder record to a database coupled to the message processing server, the pending reminder record comprising the corresponding message id and reminder time; identifying one or more due reminders using the reminder times within the stored pending reminder records; determining an inbox folder located on the remote message server and associated with the email account; and instructing the remote message server to add one or more messages to the inbox folder, wherein the one or more messages added to the inbox folder comprise information about the one or more due reminders.
 2. The method of claim 1 comprising: determining a reminders folder located on the remote message server and associated with the email account; and issuing a command to the remote mail server to copy the message to be reminded of to the reminders folder.
 3. The method of claim 2 comprising issuing a command to the remote mail server to create the reminders folder.
 4. The method of claim 1 comprising: detecting that a reply has been received for a first one of the messages to be reminded of; and deleting a stored pending reminder record associated with the first one of the messages to be reminded of.
 5. The method of claim 1 comprising: detecting that a follow up message has been sent for a first one of the messages to be reminded of; and deleting a stored pending reminder record associated with the first one of the messages to be reminded of.
 6. The method of claim 1 wherein instructing the remote message server to add one or more messages to the inbox folder comprises instructing the remote message server to add a placeholder message to the inbox folder.
 7. A computer program product embodied on a non-trasitory computer medium, the computer program product comprising instructions for: connecting, from a message processing server, to an email account located on a remote message server, the email account associated with a user; determing one or more sent folders located on the remote message server and associated with the email account; retrieving, from the remote message server, header information for one or more sent messages located within the sent folders; identifying, from the sent messages, one or more messages to be reminded of based on the retrieved header information by: extracting one or more recipient email addresses from the retrieved header information, each of the recipient email addresses associated with a TO, CC, or BCC header; splitting each of the recipient email addresses into a mailbox portion and a domain portion; and identifying at least one of the recipient email addresses having a domain portion that matches a reserved domain name, wherein the reserved domain name comprises a domain name associated with the message processing server; determining, for each of the messages to be reminded of, a message id and a reminder time using the header information, wherein determining the reminder time for a message to be reminded of comprises converting the mailbox portion of the at least one recipient email address to the reminder time; for each of the messages to be reminded of, storing a pending reminder record to a database coupled to the message processing server, the pending reminder record comprising the corresponding message id and reminder time; identifying one or more due reminders using the reminder times within the stored pending reminder records; determining an inbox folder located on the remote message server and associated with the email account; and instructing the remote message server to add one or more messages to the inbox folder, wherein the one or more messages added to the inbox folder comprise information about the one or more due reminders.
 8. The ocmputer program product of claim 7 comprising instructions for: determine a reminders folder located on the remote message server and associated with the email account; and issue a command to the remote mail server to copy the message to be reminded of to the reminders folder.
 9. The computer program product of claim 8 comprising instructions for issuing a command to the remote mail server to create the reminders folder.
 10. The computer program product of claim 7 comprising instructions for: detecting that a reply has been received for a first one of the messages to be reminded of; and deleting a stored pending reminder record associated with the first one of the messages to be reminded of.
 11. The computer program product of claim 7 comprising instructions for: detecting that a follow up message has been sent for a first one of the messages to be reminded of; and deleting a stored pending reminder record associated with the first one of the messages to be reminded of.
 12. The computer program product of claim 7 wherein instructing the remote message server to add one or more messages to the inbox folder comprises instructing the remote message server to add a placeholder message to the inbox folder. 